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Inner layer pre treatment

Inner layer pre treamtment


1. The inner layer pre-treatment: usually do not brushing, using micro-etching or electrolytic degreasing mode

2. Outer layer pretreatment: It usually adopts mechanical brushing plus micro-etching


1. The inner is DES (development, etching, to film connection)

2 outer points, if it is a positive process, it is the same as DES

If it is a negative film process, it is only developed, then dried, then SES after secondary plating

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